Some stuff

BizHawk.Client.Common/movie/MovieMnemonics.cs

@@ -190,6 +190,14 @@ namespace BizHawk.Client.Common
 		private IController Source;
 		private string ControlType;
 
+		public bool this[int player, string mnemonic]
+		{
+			get
+			{
+				return IsBasePressed("P" + player + " " + mnemonic); //TODO: not every controller uses "P"
+			}
+		}
+
 		public void SetSource(IController source)
 		{
 			Source = source;

BizHawk.Client.Common/movie/MovieRecord.cs

@@ -10,7 +10,13 @@ namespace BizHawk.Client.Common
 		private MnemonicsGenerator _mg;
 		private byte[] _state;
 
-		public string Input { get; private set; }
+		public string Input
+		{
+			get
+			{
+				return _mg.GetControllersAsMnemonic();
+			}
+		}
 
 		public bool Lagged { get; private set; }
 		public IEnumerable<byte> State
@@ -18,6 +24,11 @@ namespace BizHawk.Client.Common
 			get { return _state; }
 		}
 
+		public bool IsPressed(int player, string mnemonic)
+		{
+			return _mg[player, mnemonic];
+		}
+
 		public void SetInput(MnemonicsGenerator mg)
 		{
 			_mg = mg;

BizHawk.Client.EmuHawk/tools/TAStudio/TAStudio.cs

@@ -105,6 +105,10 @@ namespace BizHawk.Client.EmuHawk
 			{
 				text = index.ToString().PadLeft(5, '0');
 			}
+			else
+			{
+				text = _tas[index].IsPressed(1, columnName) ? columnName : String.Empty;
+			}
 		}
 
 		private void TAStudio_Load(object sender, EventArgs e)